Improvement in hot-air furnaces



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Hot- Air Furnaces. -No.153,537. Patentedluly 28,1874,

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2 Sheets-Sheet 2 C CLARK. Hut-Air Furnaces. -No.153,537. Patentedjul'y 28,1874.

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THE GRAPHICCIL PHnYmLITHJSI. 4-i PARK PLACE,N.Y.

UNITED STATES PATENT OEEIcE.

CHARLES CLARK, OF MINNEAPOLIS, MINNESOTA.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 153,537, dated July 28, 1874 application filed April 18, 1874.

To all whom it may concern:

Be it known that I, CHARLES CLARK, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented a new and Improved Hot-Air Furnace, of which the following is a specification:

In the accompanying drawing, Figure 1 represents'a vertical longitudinal section of my improved hot-air furnace; Fig. 2, a horizontal section on the line 0 c, Fig. l; and Figs. 3 and 4, respectively, are vertical transverse sections on the lines as m and y y, Fig.- 2.

Similar letters of reference indicate corresponding parts.

The invention will first be fully described, and then pointed out in the claim.

A, in the drawing, represents the fire-box, which is placed centrally in the heater, with the radiating parts arranged around the same. The fire-box A is provided in the usual manner with grate, corrugated lining, and registers in the doors of the fire-box and ash-pit, for the admission of the air to the tire and the full combustion of the fuel and fire-gases. A horizontal conical distributingradiator, B, with top extensiorrcones B,extends at the top of the fire-box along its full length, and is connected, by cylindrical or conic'ally enlarged top flues B with the same. Vertical tubes I) extend sidewise from the top radiator B, in downward direction,to horizontal drums E, which are of round, oval, or other shape, and placed sidewise of the fire-box A, in longitudinal direction. The front ends of the base drums E are provided with doors, communicating with doors or apertures in the outer shell or brick casing of the heater, for cleaning the drums from soot, ashes, or other i'mpurities collecting therein. The rear ends of drums E carry a lateral radiator, F, of pyramidal shape, with which they connect by flues E. The base drums, with the rear radiator, are suspended from the top distributingdrum without being laterally connected to the fire-box, so that the expansion or contraction of the same will carry these parts with it without breaking joints and necessitating frequent repairs. The rear drum F has a series of air-flues, F, passing through the same in the longitudinal direction of the furnace, and is also connected near its top part by a direct flue, G, with top radiator B, and by a curved top flue, H, through the shell or brick lining I of the furnace to the chimney. A damper, G, is placed into the direct flue G, and regulated by connecting crank and lever rods from the front part of the furnace. The heating action of the furnace begins on the closing of the damper, and terminates on the opening of the same, as the smoke and gases pass then directly to the chimney. .A base chamber, L, extends around the side, bottom, and rear part of the ash-pit, and communicates with the fire-box A by flues or channels L formed in the front part of the fire-box between the side wall and corrugated lining of the same. A rear flue, L of chamber L forms the connection of the same with the base of the rear radiator F. A front door serves to clean the base-chamber from the ashes, &c.

The furnace is designed for burning wood as well as coal, the different parts being made of cast and wrought iron, with shell I extending, with the exception of the front door-section, around the whole furnace, conveying the cold air to the same by an air-duct from below, and the heated air to the rooms by top fines, in the usual manner. The furnace may also be set into a suitable brick casing, as preferred. An evaporating-pan, M, is placed sidewise into the furnace, fittingaround the vertical flues, and furnishing the necessary degree of -moisture to the air heated up in its passage through the furnace.

The compact arrangement ofthe radiating parts around the top, side, and bottom of the fire-box heats up the air uniformly in the lower as well as in the upper part, and utilizes, by the large radiating-surface and circuitous course, nearly the full heating capacity of the gases of combustion.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with central fire-box- A, of radiator B, having cones B flues B and dampered flue G, the vertical tubes D, the chamber L, having flues L, the drums E F, having flues E F, and 'top flue H, all constructed and arranged substantially as and for the purpose described.

CHARLES CLARK. 

